<template>
  <view>
    <!-- 搜索组件 -->
    <my-search bg-color="#c00000" :border-radius="16" @click="goSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}" refresher-enabled>
        <view :class="index===activeIndex?'left-scroll-view-item active': 'left-scroll-view-item'" 
        v-for="(item,index) in cateList" :key="index" @click="btnFn(index)">
        {{item.cat_name}}
        </view>
      </scroll-view>
     <!-- 右侧的滚动视图区域 -->
     <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
       <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
         <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
         <!-- 动态渲染三级分类的列表数据 -->
         <view class="cate-lv3-list">
           <!-- 三级分类 Item 项 -->
           <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="goList(item3)">
             <!-- 图片 -->
             <image :src="item3.cat_icon"></image>
             <!-- 文本 -->
             <text>{{item3.cat_name}}</text>
           </view>
         </view>
       </view>
     </scroll-view>
    </view>
  </view>
</template>

<script>
	export default {
		data() {
			return {
				wh:0,
            scrollTop: 0,
        activeIndex:0,
        cateList:[], //分类数据
  cateLevel2: [],
			}
		},
    onLoad() {
        // 获取当前系统的信息
        const sysInfo = uni.getSystemInfoSync()
        // 为 wh 窗口可用高度动态赋值
        this.wh = sysInfo.windowHeight-50
        this.getCateList()
      },
		methods: {
      goSearch() {
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      },
			async getCateList(){
        const {data:res} =await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!==200) return uni.$shoewToast()
        //转层数据
        this.cateList=res.message
        this.cateLevel2 = res.message[0].children
    
      },
      btnFn(val) {
        console.log(val);
        this.activeIndex=val
        this.cateList=this.cateList[val].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      goList(val){
        uni.navigateTo({
            url:'/subpkg/goods_list/goods_list?caid='+val.cat_id
        })
      }
		}
 
	}
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
.left-scroll-view {
    width: 120px;
    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;
   
      &.active {
        background-color: #ffffff;
        position: relative;

        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
